Oooh another coffee snob thread 😀
I got rid of my Krups burr grinder and got a Timemore C2 hand grinder (~£50). Immediately and obviously better tasting and more consistent coffee. I wouldn’t bother with cheap electric grinders, if I’m just making one cup at a time I can grind by hand in less time than the kettle takes to boil. Plus it’s much smaller and easier to clean.
Tried Lavazza Red and some other supermarket beans and they’re really unpleasant. I guess some people like the burnt flavour.